DRAFT Freight Performance Measures

Transcription

1 DRAFT Freight Performance Measures The purpose of the Industrial Areas Freight Access Project is to conduct a focused and pragmatic technical evaluation to identify and assess current and future freight bottlenecks and problem locations, and develop a set of cost-effective operational and/or capital improvements. Freight performance measures are one of the key technical tools in understanding freight network conditions. While the context of rail freight operations will be noted, the project metrics will look primarily at truck freight operations on arterial streets. Performance measures can be used in three ways: (1) evaluate existing conditions, including bottlenecks (2) monitor conditions over time, including before/after studies (3) forecast impacts relative to possible improvements Freight performance measures can be grouped into these categories: system demand, system efficiency, system reliability, mobility barriers, and safety/physical conditions. The following describes how these measures might be used in the context of this project. System Demand System demand refers to volume of vehicles or goods that are being moved through the freight network. This provides both basic tracking of movement of goods, but also a way to normalize results of other performance metrics. System Efficiency System efficiency refers to the amount of average delay encountered by freight traffic, or average network congestion. This tracks congestion at a corridor level on an average day. System Reliability System reliability refers to measuring how travel times may vary day-to-day. Typically, freight operators plan according to the bad days and not average days. This metric addresses if the bad days are getting better or not. Mobility Barriers Mobility barriers refer to bottleneck locations and other specific locations of barriers to freight mobility. This metric is a pragmatic way of tracking if highly visible locations are being addressed. Safety and Condition Safety and condition refers to the actual physical and safety conditions of existing freight facilities. These metrics help determine when freight facilities need to be replaced or upgraded and rate of deterioration, along with where hazards exist. Example Metrics: Total Traffic Volumes Freight Traffic Volumes Freight Tonnage Example Metrics: Percent of Freight Network Delayed Percent of Freight Network Congested Maximum Throughput Travel Time Index Total Delay or Delay per Truck Example Metrics: 50th-Percentile Travel Time along Freight Corridor 80th-Percentile Travel Time 95th-Percentile Travel Time Buffer Index Example Metrics: Bottlenecks per Corridor At-Grade Crossings per Corridor Removal of Freight Barriers Route Accessibility Example Metrics: Bridge Structure Conditions Pavement Conditions Weight Load Restrictions Freight Collision Rates

2 Industrial Areas Freight Access Project (FAP) Freight Advisory Board January 21,

3 Key Outcomes from Last Meeting Identified Challenges/Solutions Street Paving/Construction Traffic Signals Obstructions/Clearances Traffic Operations/Congestion Other Issues Stakeholder Outreach Businesses in the MICs Shippers/Carriers Others 2

4 PERFORMANCE MEASURES Purpose in Context of the FAP Evaluate System Conditions Prioritize Projects Communicate Results Items we have Considered WSDOT Freight Plan MAP-21 Performance Guidance Best Practices Data Availability / Resources 3

5 PERFORMANCE MEASURES Key Categories 1. System Demand 2. System Efficiency 3. System Reliability 4. Mobility Barriers 5. Safety and Condition *Performance is based upon a combination of several measures 4

6 1. SYSTEM DEMAND What it Measures Scale of freight activity along a corridor Possible Metrics Total Traffic Volumes Truck Volumes Tonnage per Corridor 5

7 2. SYSTEM EFFICIENCY What it Measures Travel times / delays along a network for a defined period Possible Metrics Total Delay by Corridor during Peak Periods* Annual Hours of Truck Delay by Corridor * Prioritized for freight activity 6

8 3. SYSTEM RELIABILITY What it Measures Variability of travel time or delay Possible Metrics 80 th Percentile Travel Time by Corridor Buffer Index (95 th Percentile) per MIC 95 th Percentile 7

9 4. MOBILITY BARRIERS What it Measures Bottleneck locations or route constraints Possible Metrics Bottlenecks per Corridor At-grade Crossings 8

10 5. SAFETY AND CONDITION What it Measures Collisions and roadway conditions Possible Metrics Freight Collision Rates Pavement Conditions Potential Modal Conflicts 9

11 Questions to Consider Do these measures capture how we should be evaluating the health of the transportation system for freight? Are these measures relevant to routing decisions? What are we missing? 10